Designing porous C/C composites for oxidation resistance with an analytical model based on the kinetic and architectural features of fibers and matrix

Preparation of a Gradient Anti-Oxidation Coating for Aircraft C/C Composite Brake Disc and Its High-Temperature In Situ Self-Healing Performance

“…The C/C composite material with the gradient coating that was oxidized in static air at 700 • C for 15 h had a weight loss rate of −0.17%; this negative weight loss rate is due to weight gain after B 4 C oxidizes into B 2 O 3 . At present, the oxidative weight loss rates of phosphate coating and composite coating widely used in C/C composite brake discs are about 4% and 1%, respectively, at 700 • C for 10 h. The test results show that the gradient coating has a continuous antioxidant effect at 700 • C [19,25,26]. The weight loss rate of the gradient coating was 7.23% in static air at 900 • C for 15 h. During the 4 h of 1000 • C static air oxidation, the weight loss rate was still less than 10%; it continued to oxidize, and the weight loss rate continued to rise.…”

“…After 50 consecutive cycles of 900 • C~room temperature, the coating and the substrate did not flake off, and basically, no weight loss occurred. Compared with the thermal shock weight loss rate of more than 2% for phosphate coating and 1% for composite coating of existing brake discs [19,25,26], the gradient coating has a better thermal shock resistance. at room temperature after taking out the sample for one cycle, and fifty cycles were carried out continuously.…”

“…C/C composites is more in the anti-ablation or material modification of structural materials and is not applicable to aircraft brake materials [14][15][16][17][18][19]. There are few public literature reports on the in situ high-temperature self-healing performance of coatings or verifications of anti-oxidation performance through brake disc product braking tests according to CTSO-135a [20][21][22].…”